Related Experiment Video
Updated: Jul 11, 2026

06:55
Kinematic History of a Salient-recess Junction Explored through a Combined Approach of Field Data and Analog Sandbox Modeling
Published on: August 5, 2016
Forecasting southern california earthquakes.
Summary
California is experiencing more moderate to large earthquakes since 1978. This increased seismicity, linked to strain accumulation changes, raises the annual probability of a major earthquake to 13%.
Area of Science:
- * Geophysics and seismology, focusing on earthquake prediction and seismic hazard assessment in California.
Background:
- * California has observed a significant increase in moderate to large earthquakes since 1978-1979 compared to the previous 25 years.
- * Historical periods of increased seismicity have preceded major destructive earthquakes (magnitude 7+).
Purpose of the Study:
- * To analyze the recent increase in California seismicity and its potential implications for future earthquake occurrences.
- * To investigate the correlation between seismicity patterns and crustal strain accumulation.
- * To assess the potential for a great earthquake on the San Andreas fault.
Main Methods:
- * Analysis of historical earthquake frequency data for California.
- * Examination of seismic strain accumulation patterns.
- * Assessment of fault displacement potential on the San Andreas fault.
Main Results:
- * A marked deviation in strain accumulation patterns is associated with the increased seismicity.
- * The annual probability of a magnitude 7+ earthquake in California is now 13%.
- * The San Andreas fault in southern California has accumulated significant potential displacement since 1857.
Conclusions:
- * The recent increase in seismicity and altered strain patterns suggest a heightened seismic risk in California.
- * There is a substantial potential for a great earthquake (magnitude > 7.5) on the San Andreas fault due to accumulated strain.
Related Concept Videos
Fault Types
When analyzing a single line-to-ground fault from phase A to ground at a three-phase bus, it is important to consider the fault impedance. This impedance is zero for a bolted fault, equal to the arc impedance for an arcing fault, and represents the total fault impedance for a transmission-line insulator flashover. To derive sequence and phase currents, fault conditions are translated from the phase domain to the sequence domain.
For line-to-line faults occurring between phases B and C, the...
For line-to-line faults occurring between phases B and C, the...
Non-destructive Tests for Concrete Strength
The rebound hammer test, also known as the Schmidt hammer test, is a non-destructive technique for evaluating the hardness of concrete and, indirectly, the strength of concrete. It operates on the principle that the rebound of a spring-driven mass from a concrete surface correlates to the surface's hardness. The device comprises a mass within a tubular housing, a spring mechanism, and a plunger that strikes the concrete. Upon release, the energy imparted to the mass by the spring causes it to...
Microcracking in Concrete
Microcracking in concrete refers to the tiny cracks that can form within the material even before any external load is applied. These microcracks typically occur at the interface between the coarse aggregate and the hydrated cement paste, often as a result of differential volume changes prompted by variations in stress-strain behavior, as well as thermal and moisture movement. Initially, these microcracks remain stable and do not grow substantially until the concrete is stressed to about 30...
Accelerators
Accelerators in concrete serve as admixtures to speed up the hardening process, enabling the concrete to achieve early strength faster. Although accelerators do not necessarily impact the time it takes concrete to set, they reduce this time in practice. A common accelerator is calcium chloride, which is particularly useful for hastening early strength development in cold weather or for rapid repair jobs that require quick heat generation after mixing.
The effectiveness of calcium chloride can...
The effectiveness of calcium chloride can...
Local Attraction
Local attraction refers to disturbances in compass readings caused by magnetic influences from nearby objects such as metal fences, buried pipes, vehicles, buildings, power lines, or natural iron ore deposits. Small items like wristwatches, steel tools, or belt buckles can also interfere with the compass by creating local magnetic fields that distort the Earth's natural magnetic field. These distortions lead to inaccurate readings, posing navigation and land surveying challenges.Local...
Hazard Rate
The hazard rate, also known as the hazard function or failure rate, is a statistical measure used to describe the instantaneous rate at which an event occurs, given that the event has not yet happened. From a probabilistic perspective, it represents the likelihood that a subject will experience the event in a very small time interval, conditional on surviving up to the beginning of that interval. In terms of frequency, the hazard rate can be viewed as the ratio of the number of events to the...

